Here's an example of translating from English to French.

#!/usr/bin/env perl

use WebService::GoogleAPI::Client;
use Data::Dumper qw (Dumper);
use strict;
use warnings;
use feature 'say';

=head1 translation_example.pl

=head2 PRE-REQUISITES

Setup a Google Project in the Google Console and add the Translate API
+ Library. You may need 
to enable billing to access Google Cloud Services.
Setup an OAUTH Credential set and feed this into the CLI goauth 
included in WebService::GoogleAPI::Client and use the tool to authoris
+e
your user to access the project which will also create the local gapi.
+json config.

=over 2

=item https://www.googleapis.com/auth/cloud-translation

=item https://www.googleapis.com/auth/cloud-platform

=item assumes gapi.json configuration in working directory with scoped
+ project and user authorization

=back

Translation Service Specification:

                         'discoveryRestUrl' => 'https://translation.go
+ogleapis.com/$discovery/rest?version=v2',
                         'description' => 'Integrates text translation
+ into your website or application.',
                         'preferred' => $VAR1->{'items'}[0]{'preferred
+'},
                         'kind' => 'discovery#directoryItem',
                         'id' => 'translate:v2',
                         'version' => 'v2',
                         'title' => 'Cloud Translation API',
                         'icons' => {
                                      'x32' => 'https://www.gstatic.co
+m/images/branding/product/1x/googleg_32dp.png',
                                      'x16' => 'https://www.gstatic.co
+m/images/branding/product/1x/googleg_16dp.png'
                                    },
                         'name' => 'translate',
                         'documentationLink' => 'https://code.google.c
+om/apis/language/translate/v2/getting_started.html'
                       },


=cut

## assumes gapi.json configuration in working directory with scoped pr
+oject and user authorization

## manunally sets the client user email to be the first in the gapi.js
+on file
my $gapi_client = WebService::GoogleAPI::Client->new( debug => 0, gapi
+_json => 'gapi.json', debug=>1 );
my $aref_token_emails = $gapi_client->auth_storage->storage->get_token
+_emails_from_storage;
my $user              = $aref_token_emails->[0];  
$gapi_client->user( $user ); ## set to the first authorised user email
+ 

# my $list = $gapi_client->discover_all();
# say Dumper $list;


# list available api endpoints
#my $r = $gapi_client->api_query(  api_endpoint_id => 'translate.langu
+ages.list'); 
#say Dumper $r->json;


## https://cloud.google.com/translate/docs/reference/translate
my $r = $gapi_client->api_query(  api_endpoint_id => 'translate.transl
+ations.translate', 
                                  options => { 
                                      q=>'this is some text to transla
+te into french',
                                      target => 'fr',
                                      format => 'text',
                                  } );
say Dumper $r->json;
say $r->json->{data}{translations}[0]{translatedText};
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